unwingable
/ˌʌnˈwɪŋəbəl/Definitions
1. adjective
Not able to be winged or given wings.
“The idea of flying cars is currently unwingable due to current technology.”
2. adjective
Lacking the ability to fly or move with the agility of a bird.
“The injured bird was left unwingable and had to be taken care of by its owner.”